covered by this flora includes all of the INEEL, immediately
adjacent foothills of the Lost River and Lemhi Ranges, and all
of Big Southern Butte. The
flora consists of 472 species of vascular plants in 59
families; 409 species occur on the INEEL proper. Six subspecies and eight varieties are included herein,
bringing the total number of recognized taxa to 486.
The largest families are the:
(sunflower family) with 82 species,
(grass family) with 49 species,
(mustard family) with 43 species,
(pea or legume family) with 36 species.
species can be classified according to life history and growth
form as follows:
(67.8%) are perennials
(29.0%) are annuals
( 2.1%) are biennials
5 ( 1.1%) are
58 (12.3%) are graminoids (grasses/grass-like plants)
44 ( 9.3%) are
11 ( 2.3%) are
3 ( 0.6%) are
1 ( 0.2%) is a
403 (85.4%) native species, while 69 (14.6%) are introduced.
Of the 403 native species,
(74.7%) are forbs
(10.9%) are shrubs
(10.9%) are graminoids
( 2.5%) are trees
0.7%) are succulents
0.2%) is a climbing vine.
Of the 69
(44.9%) are annuals
(78.3%) are forbs
(20.3%) are grasses.
lists of vascular plants at the INEEL were prepared by Atwood
(1970) and Jeppson and Holte (1978).
Herbarium collections of the INEEL flora were
established in the Ray J. Davis Herbarium, Idaho Museum of
Natural History, and at the INEEL in 1976.
Additional collections were made by Anita Cholewa and
Douglass Henderson in 1982, by James Glennon in 1990 and by
Karl Holte and James Glennon in 1993.
Holte and Glennon made extensive searches of the INEEL
and immediate vicinity during the exceptionally wet 1993
growing season. Glennon
added eight additional species while collecting data from the
long-term vegetation plots in 1995.
Specimens were identified using Flora
of Idaho (Davis, 1952),
Flora of the Pacific Northwest (Hitchcock & Cronquist,
1973), Vascular Plants of
the Pacific Northwest (Hitchcock, et. al.,1955), Intermountain Flora (Cronquist, et. al., 1972, 1977, 1984, 1989,
follows Beetle and Young (1965) for subspecies of Artemisia
tridentata and Barkworth et al. (1983) for members of the
names generally are from Hitchcock and Cronquist (1973).
Taxonomy was verified by Karl Holte and nomenclature was
updated utilizing The
PLANTS database (USDA, 1995).
Voucher specimens for all of the plants listed are in
the INEEL or Big Southern Butte collections at the Ray J. Davis